X0202 4 2007-08-27 0 0000003982 Allis Chalmers Energy Inc. ALY 0001141105 NEDERLANDER ROBERT E ET AL 1450 BROADWAY 20TH FLOOR NEW YORK NY 10018 1 0 0 0 Common Stock 2007-08-27 4 S 0 600 20.4 D 242566 I By RER Corp. Common Stock 2007-08-27 4 S 0 1300 20.42 D 242566 I By RER Corp. Common Stock 2007-08-27 4 S 0 700 20.43 D 240566 I By RER Corp. Common Stock 2007-08-27 4 S 0 1900 20.45 D 238666 I By RER Corp. Common Stock 2007-08-27 4 S 0 1000 20.47 D 237666 I By RER Corp. Common Stock 2007-08-27 4 S 0 300 20.51 D 237366 I By RER Corp. Common Stock 2007-08-27 4 S 0 400 20.52 D 236966 I By RER Corp. Common Stock 2007-08-27 4 S 0 500 20.5201 D 236466 I By RER Corp. Common Stock 2007-08-27 4 S 0 400 20.53 D 236066 I By RER Corp. Common Stock 444066 D The Reporting Person owns 100% of the issued and outstanding stock of RER Corp. 266,666 shares previously reported as owned by RER Corp. have been corrected to reflect that those shares are owned by the Reporting Person directly. The Form 4's previously filed for the Reporting Person on January 31, 2006, February 6, 2006 and November 3, 2006 incorrectly reported the form of ownership of such shares. This report is the second of two reports, each on a separate Form 4, but all relating to the Reporting Person's transactions on August 27, 2007. /s/ Theodore F. Pound III under Power of Attorney 2007-08-30